标准摘要
[中文适用范围]： 本标准规定了在指定的测试条件下，测定支持小型垂直试样燃烧所需的氧与氮混合气中氧的最小体积分数的方法。测定结果定义为氧指数（OI）值。该方法适用于以垂直条状或板状形式自支撑、厚度不超过10.5 mm的材料测试，适用于表观密度为100 kg/m³或更高的固体、层压或蜂窝材料。该方法也可能适用于表观密度低于100 kg/m³的某些蜂窝材料。提供了一种在垂直支撑下测试柔性片材或薄膜材料的方法。为进行比较，提供了一种确定材料的氧指数是否高于某个指定最小值的过程。注：可能无法令人满意地将这些方法应用于加热时表现出高水平收缩的材料，例如高度取向的薄膜。 [外文原描述]： ISO 4589-2:2017 specifies methods for determining the minimum volume fraction of oxygen, in admixture with nitrogen, that will support combustion of small vertical test specimens under specified test conditions. The results are defined as oxygen index (OI) values. Methods are provided for testing materials that are self-supporting in the form of vertical bars or sheets up to 10,5 mm thick. These methods are suitable for solid, laminated or cellular materials characterized by an apparent density 100 kg/m 3 or greater. The methods might also be applicable to some cellular materials having an apparent density of less than 100 kg/m 3 . A method is provided for testing flexible sheets or film materials while supported vertically. For comparative purposes, a procedure is provided for determining whether or not the OI of a material lies above some specified minimum value.
英文名称Plastics — Determination of burning behaviour by oxygen index — Part 2: Ambient-temperature test